John

The DuPont CB-100 will increase the amount of heat that can be conducted
through the barrel.  My experience with it that most people overestimate
what it can do.  I've done calculations that show for a 0.020" drilled hole
with 0.001" copper barrel, adding CB-100 only increases the amount of heat
by less than 5%. The reason is the CB-100 has a thermal conductivity of 5.23
W/mK vs 395 W/mK for copper.  Even though CB-100 makes up the majority of
the cross sectional area, it only adds a little to the "thermal" cross
section.

I always recommend that potential users of this technology run the numbers
themselves and balance the potential cost increase with the improved
performance.

> ----------
> From:         John Foster[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;John Foster
> Sent:         Tuesday, April 23, 2002 12:06 PM
> To:   [log in to unmask]
> Subject:      [TN] Via Plug
>
> Hello, I am new to this listserver. I must say that it is very
> informative. I wish I had known of it long ago.
>
> I have a question about via plugging.  Right now
> our board vendor is doing our via plugs with
> I guess with a standard epoxy. We are trying
> to find a solution that would give us a much
> better thermal performance.
>
> We are looking at silver epoxy and this
> material from Dupont.  Does anyone know of
> some material that would give us a really good
> thermal performance. We are in a commercial
> environment. So the material does not have to
> meet industrial specs.
>
> Any input on this matter would be greatly '
> appreciated.
>
> Thank You
>
> John Foster
>
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